Ambrosia ambrosioides, also known as canyon ragweed or chicura is a ragweed found in the deserts of northern Mexico and ranging into the southern half of Arizona. Growing as a shrub from 1-2 meters high, its elongate, coarsely-toothed leaves range from 4-18 centimeter long and 1.5-4 centimeter wide. It is monoecious, with both terminal and axillary racemes consisting of staminate heads occurring above their pistillate counterparts. Flowering occurs mainly in February through April. The fruits are 10-15 millimeter burs covered with hooked spines.
Ambrosia ambrosioides
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